Laser ignition experiments are performed on nanocomposite Al/MoO3 thermites of varying composition. Three separate Al particle diameter size composites ranging from 29.9 to 108 nm are analyzed separately. Samples were pressed into cylindrical pellets and laser ignited at one end. High-speed imaging was used to measure ignition time and burn rates. One objective is to identify the relationship between particle size and ignition sensitivity. Results show that decreasing Al particle size leads to less variability in ignition time and burn rate as a function of composition.